skuzzy.. I remember today at around 2:45pm PDT today, I also couldnt get in either.. I logged in, and every arena showed up as closed, so exited and tried again, and got one of either host not found or host connection lost or "host something or something".. waited another 20 minutes or so, logged in no problem..
I can understand the host not found or host connection lost error where it pops up a box that says plainly that something is wacked... is the successful login and ah2 showing closed arenas the same thing?